An upright photopolymerization 3D printing device

Abstract

This application belongs to the field of additive manufacturing, and particularly relates to an upright photopolymerization 3D printing device, which includes a projector, a feeding assembly, a build assembly, a scraper assembly, a power assembly, and a platform. The feeding assembly and the build assembly are mounted on the platform. Driven by the power assembly, the scraper assembly scrapes the raw material from the feeding assembly to the build assembly station. The raw material is then irradiated and shaped by the projector. The feeding and building processes are repeated to obtain a complete workpiece. This application has the effect of completing feeding, leveling, and compaction in the same step.

Description

Technical Field

[0001] This application relates to the field of additive manufacturing, and in particular to an upright photopolymerization 3D printing device. Background Technology

[0002] Digital Light Processing (DLP) 3D printing technology is a second-generation photopolymerization technology that emerged at the end of the last century.

[0003] Compared to stereolithography (SLA), which uses a laser head to scan and shape layer by layer, DLP technology mainly uses a projector to solidify a photosensitive polymer liquid layer by layer. Each time the projector works, it shapes a working section without waiting for the scanning process, thus creating 3D printed objects more efficiently.

[0004] However, the material placement process of upright DLP 3D printing requires pouring metal paste first and then smoothing it out. The cumbersome material placement process affects production efficiency, and there is an urgent need for an upright photopolymer 3D printing device that can achieve rapid material placement. Summary of the Invention

[0005] To address the aforementioned issues and improve the material placement efficiency of upright photopolymer 3D printing, this application provides an upright photopolymer 3D printing device.

[0006] The present application provides an upright photopolymerization 3D printing device with the following technical solution.

[0007] An upright photopolymer 3D printing device includes a projector, a feeding assembly, a build assembly and a scraper assembly, a power assembly, and a frame;

[0008] The feeding assembly includes a feeding platform, a feeding pool, and a feeding screw. The sidewall of the feeding pool is perpendicular to its bottom surface. The feeding platform is disposed within the feeding pool and its edge is sealed to the sidewall of the feeding pool. The feeding platform and the feeding screw are rotatably connected. Rotation of the feeding screw causes the feeding platform to move away from or towards the bottom surface of the feeding pool. The building assembly includes a building platform, a building pool, and a building screw. The sidewall of the building pool is perpendicular to its bottom surface. The building platform is disposed within the building pool and its edge is sealed to the sidewall of the building pool. The building platform and the building screw are rotatably connected. Rotation of the building screw causes the building platform to move away from or towards the bottom surface of the building pool.

[0009] The frame includes a horizontal forming platform and two equipment holes formed on the forming platform. The building pool and the feeding pool are respectively fixedly connected in the equipment holes. The upper edge of the feeding pool and the upper edge of the building pool are flush with the forming platform. The projector is set on the side of the building assembly away from the building screw, and the light emission direction is towards the building pool.

[0010] The scraper assembly includes a blade holder and a blade connected to the blade holder, the cutting edge of the blade abutting against the forming table surface; the power assembly is used to drive the feed screw and the construction screw to rotate, and to drive the blade holder to move in a direction parallel to the forming table surface.

[0011] By adopting the above technical solution, the feeding platform rises and ejects a predetermined volume of printing material, while the building platform descends, carrying the formed green body and unformed material down, leaving a space of one working slice thickness. During the movement of the scraper assembly, the blade edge scrapes across the forming table, pushing the metal paste overflowing from the feeding assembly onto the forming table and transferring it to the space left by the building assembly. At the same time, leveling is completed, ensuring that the metal paste in the building pool has a flatness that meets the production printing requirements. The material laying and leveling are completed in the same process, improving production efficiency.

[0012] Optionally, the scraper assembly further includes a heater for heating the blade; the build assembly further includes a cooling plate for cooling or solidifying the metal slurry in the build pool.

[0013] By adopting the above technical solution, the metal slurry in the construction pool is at a low temperature, has a high viscosity, is not easily disturbed, and can maintain the surface flatness; when the blade scrapes, the metal slurry is briefly heated, its fluidity is enhanced, which is conducive to the scraping process; after scraping, it is cooled to maintain flatness.

[0014] When the metal paste is cooled to solidify, the cut surface of the build pool, the light-cured area and the low-temperature curing area form a whole, providing stable support for the subsequent working plane. Moreover, even if the supporting skeleton of the component is not printed simultaneously, the component will not collapse when printing in this case.

[0015] Optionally, the upright photopolymerization 3D printing equipment further includes a roll pressing assembly, which includes a roller shaft, a roller sleeve, and a roll pressing screw. The roll pressing screw and the roller shaft are perpendicular to each other, and the plane formed by the axis of the roll pressing screw and the axis of the roller shaft is a horizontal plane. The axial direction of the roll pressing screw is parallel to the line connecting the geometric centers of the two equipment holes. The roller sleeve is sleeved on the roller shaft and abuts against the forming table surface. The roll pressing screw is used to drive the roller shaft to translate along the roll pressing screw, so that the roller sleeve rolls the material in the feed pool and the build pool.

[0016] By adopting the above technical solution, for metal slurries with a large gas content or loose metal powder, after the scraper assembly spreads the material, the roller assembly can compact the raw material, so that it fits tightly with the formed green blank, ensuring the tightness of the bond between two adjacent working slices and avoiding the need for post-annealing treatment.

[0017] Optionally, the roller sleeve is embedded with a resistance wire for heating the roller sleeve.

[0018] By adopting the above technical solution, when the roller sleeve rolls the metal slurry, the metal slurry is briefly heated, which enhances its fluidity. This is beneficial for both leveling the slurry and for the escape of air bubbles, thus reducing the probability of porosity.

[0019] Optionally, the power assembly includes a main gear, the feeding assembly includes a feeding gear located at the end of the feeding screw away from the forming platform, and the building assembly includes a building gear located at the end of the building screw away from the forming platform. The main gear meshes with the feeding gear and the building gear respectively, and the feeding screw and the building screw rotate synchronously while the main gear rotates.

[0020] By adopting the above technical solution, the feeding screw and the building screw are driven by the same main gear. On the one hand, this reduces the number of components and the size of the device. On the other hand, when the ratio of the cross-sectional area of ​​the feeding pool to the building pool is fixed and the raw material compression ratio is fixed, the feed rate of the two pools is controlled by the gear transmission ratio, which has high stability and also reduces the programming burden.

[0021] Optionally, the tool holder includes a main tool holder and a secondary tool holder. One side of the main tool holder is connected to the power assembly, and the other side has a tool holder slide groove perpendicular to the forming table surface. The secondary tool holder is slidably connected in the tool holder slide groove and is connected to the blade.

[0022] By adopting the above technical solution, when the secondary blade holder is far away from the forming table, a gap appears between the blade edge and the forming table, making the material in the building pool higher than the forming table. The extra material ensures the compaction effect of the rolling step.

[0023] Optionally, the secondary blade holder and the blade are rotatably connected, and the rotation axis is perpendicular to the forming table surface.

[0024] By adopting the above technical solution, after the scraper assembly runs to its two extreme positions, the blade rotates 180° relative to the secondary blade holder, so that the same side of the blade pushes the flow during both the forward and reset processes. On the one hand, this avoids the metal slurry or powder adhering to the back from falling off and affecting the flatness of the scraped area. On the other hand, it also ensures the utilization rate of irregularly shaped blades.

[0025] Optionally, the side of the blade used for scraping the liquid forms an acute angle with the forming table surface, and the acute angle is less than 60°.

[0026] By adopting the above technical solution, in addition to applying a thrust parallel to the forming table surface to the raw material during the blade's movement, there is also a component force vector toward the forming table surface, which achieves the effect of pre-compacting.

[0027] Optionally, the side of the blade closest to the forming table is bent to a horizontal position, such that the side of the blade used for scraping the liquid partially fits against the forming table.

[0028] By adopting the above technical solution, in addition to applying a thrust parallel to the forming table surface to the raw material during the blade's movement, there is also a component force vector toward the forming table surface, which achieves the effect of pre-compacting.

[0029] Optionally, the wavelength of the light emitted by the projector is 355nm or 405nm.

[0030] By adopting the above technical solution, the light emitted by the projector has higher energy, and the printing efficiency is higher.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The scraper assembly completes both material placement and smoothing in one stroke, reducing the time consumed in the material placement process of DLP printing and improving productivity;

[0033] 2. The roller pressing assembly, which operates in sequence with the scraper assembly, flattens and compacts the raw materials to be processed, and has a good leveling effect, especially for powders and slurries with high viscosity;

[0034] 3. The blades of the scraper assembly and the roller sleeves of the roller pressing assembly can be heated. The part of the construction pool of the construction assembly near the blades and roller sleeves can cool the raw material, so that the raw material in the construction pool is in a high viscosity state and is not easily disturbed. In addition, when the raw material comes into contact with the blades or roller sleeves, the local area that is scraped and rolled has good fluidity, which is convenient for leveling.

[0035] 4. The cooling plate in the build tank cools the molten metal in the build tank into a solid state, forming a stable whole with the photocured part, providing support for the next part to be printed, without the need for an additional printed support skeleton.

[0036] 5. The secondary blade holder of the scraper assembly can be far away from or close to the forming table relative to the main blade holder, and the blade can rotate relative to the secondary blade holder. The former allows a small amount of material to be scraped back into the feeding pool by the returning blade during the spreading process, and also avoids the defect of insufficient spreading. The latter ensures that the material is scraped on the same side of the blade during the round trip, and avoids material from sticking to the back of the blade and splashing onto the forming table, or being stuck to the raw material in the building pool, which would affect the flatness of the raw material in the building pool.

[0037] 6. The blade is at an acute angle to the forming table, or bent to fit against the forming table, so that the material laying process has a compacting effect on the raw material, further avoiding defects such as porosity and shrinkage in the formed workpiece; at the same time, before forming each layer, the next raw material and the already formed green body are tightly bonded together, optimizing the adhesion between the working slices, and even omitting the subsequent heat treatment. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the upright photopolymerization 3D printing device according to Embodiment 1 of this application;

[0039] Figure 2 This is a top view of the upright photopolymerization 3D printing device of Embodiment 1 of this application;

[0040] Figure 3 It is along Figure 2 Cross-sectional view of line AA in the middle;

[0041] Figure 4 This is a schematic diagram of the scraper assembly of Embodiment 1 of this application;

[0042] Figure 5 This is a cross-sectional view of the scraper assembly of Embodiment 1 of this application;

[0043] Figure 6 This is a cross-sectional view of the scraper assembly of Embodiment 2 of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Projector; 2. Feeding assembly; 21. Feeding platform; 22. Feeding pool; 23. Feeding screw; 24. Feeding gear; 3. Construction assembly; 31. Construction platform; 32. Construction pool; 33. Construction screw; 34. Construction gear; 4. Scraper assembly: 41. Blade; 42. Secondary blade holder; 43. Main blade holder; 44. Blade holder groove; 5. Roller assembly; 51. Roller shaft; 52. Roller sleeve; 53. Roller screw; 54. Roller groove; 6. Power assembly; 61. Main gear; 62. Guide rail blade; 63. Roller motor. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-6 In further detail, it should be noted that the accompanying drawings only show the important structures of this application. Some structures that are not related to the inventive point, such as the shell, have been simplified. Their absence in the drawings does not mean that they do not exist.

[0047] This application discloses an upright photopolymerization 3D printing device.

[0048] Example 1

[0049] Reference Figure 1 , Figure 2 The upright photopolymer 3D printing equipment includes a projector 1, a feeding assembly 2, a build assembly 3, a scraper assembly 4, a roller assembly 5, a power assembly 6, and a frame.

[0050] refer to Figure 3 The feeding assembly 2 includes a feeding platform 21, a feeding pool 22, and a feeding screw 23. The sidewall of the feeding pool 22 is perpendicular to its bottom surface. Specifically, in this embodiment, the feeding pool 22 includes four mutually perpendicular rectangular thin plates, which form a hollow square tube. The rectangular bottom surface formed by the upper and lower edges of the square tube is perpendicular to each thin plate. The junction of two adjacent thin plates is sealed and rounded. The feeding platform 21 is disposed inside the feeding pool 22, and its upper surface is perpendicular to the sidewall of the feeding pool 22. The edge of the feeding plane is sealed to the sidewall of the feeding pool 22. A screw sleeve is provided on the frame. The screw sleeve includes a first screw hole that cooperates with the feeding screw 23. The feeding screw 23 passes through the first screw hole and is rotatably connected to the lower surface of the feeding platform 21. The rotation of the feeding screw 23 causes the feeding platform 21 to move away from or closer to the bottom surface of the feeding pool 22.

[0051] refer to Figure 1 , Figure 2The construction component 3 includes a construction platform 31, a construction pool 32, and a construction screw 33. The sidewall of the construction pool 32 is perpendicular to its bottom surface. In this embodiment, the structure of the construction pool 32 is similar to that of the feeding pool 22, but it additionally includes a cooling plate. The cooling plate is located near the forming table surface of the construction pool 32 and is used to cool the metal slurry in the construction pool 32. Alternatively, the cooling plate is evenly distributed on the sidewall of the construction pool 32 and is activated step by step as the construction platform 31 descends to solidify the metal slurry in the construction pool 32.

[0052] The refrigeration element can be one or more of compressor refrigeration or semiconductor refrigeration.

[0053] The construction platform 31 is disposed within the construction pool 32, with its upper surface perpendicular to the side wall of the construction pool 32, and the edge of the construction plane is sealed to the side wall of the construction pool 32. The screw sleeve also includes a second screw hole that mates with the construction screw 33. The construction screw 33 passes through the second screw hole and is rotatably connected to the lower surface of the construction platform 31. Rotation of the construction screw 33 causes the construction platform 31 to move away from or closer to the bottom surface of the construction pool 32. The screw direction of the construction screw 33 is opposite to that of the feeding screw 23.

[0054] Preferably, in the case where the cooling element solidifies the metal slurry, the upper surface of the build platform 31 is provided with an adhesion groove, and the cross-sectional area of ​​the adhesion groove increases with distance from the upper surface of the build platform 31. This is used to provide gripping force for the entire solidified metal slurry within the build pool 32, preventing it from adhering to the sidewalls of the build pool 32.

[0055] Preferably, heating elements are also uniformly provided on the sidewalls of the construction pool 32.

[0056] Preferably, the feeding assembly 2 also includes cooling plates uniformly arranged in the feeding pool 22 for cooling and solidifying the metal slurry to prevent the powder particles in the metal slurry from settling or the components from segregating due to gravity.

[0057] The frame includes a horizontal forming table and two equipment holes opened on the forming table. The building pool 32 and the feeding pool 22 are fixedly connected in the equipment holes. The upper edge of the feeding pool 22 and the upper edge of the building pool 32 are flush with the forming table.

[0058] refer to Figure 4 , Figure 5 The scraper assembly 4 includes a main blade holder 43, a secondary blade holder 42, and a blade 41. One side of the main blade holder 43 is connected to the power assembly 6, and the other side has a blade holder groove 44 perpendicular to the forming table surface. The secondary blade holder 42 is slidably connected in the blade holder groove 44 and rotatably connected to the blade 41. The rotation axes of the secondary blade holder 42 and the blade 41 are perpendicular to the forming table surface. When the secondary blade holder 42 is at the lower limit position of the blade holder groove 44, the cutting edge of the blade 41 abuts against the forming table surface.

[0059] Optionally, the cutting edge of the blade 41 may be made of a flexible material, or a spring may be fitted on the rotating shaft between the blade 41 and the secondary blade holder 42 to press the blade 41 against the forming table.

[0060] Preferably, the scraper assembly 4 further includes a heater, which is located near the secondary blade holder 42 on the blade 41 for heating the blade 41.

[0061] refer to Figure 1 , Figure 2 The rolling assembly 5 includes a roller shaft 51, a roller sleeve 52, and a rolling screw 53. The plane formed by the axis of the rolling screw 53 and the axis of the roller shaft 51 is horizontal, and the rolling screw 53 and the roller shaft 51 are perpendicular to each other. The axial direction of the rolling screw 53 is parallel to the line connecting the geometric centers of the two equipment holes. The roller sleeve 52 is sleeved on the roller shaft 51, and its side near the forming table abuts against the forming table. The roller sleeve 52 has an embedded resistance wire for heating. The rolling screw 53 drives the roller shaft 51 to translate along the rolling screw 53, so that the roller sleeve 52 rolls the material in the feeding pool 22 and the forming pool 32. Specifically, a rolling groove 54 parallel to the axial direction of the rolling screw 53 is provided on one side of the rolling screw 53. The roller shaft 51 is threadedly connected to the rolling screw 53 and slides within the rolling groove 54.

[0062] The projector 1 is located on the side of the build assembly 3 away from the build screw 33, and the light emission direction is towards the build pool. The light source can be any one or more of DLP light source, LCD light source or SLA low power laser light source. The focal length is configured as the distance between the projector 1 and the forming table. The wavelength of the light emitted by the projector 1 is preferably 355nm or 405nm.

[0063] The power assembly 6 includes a main gear 61, guide vanes 62, and a roller press motor 63, which are used to drive the feed screw 23, the building screw 33, and the roller press screw 53 to rotate, and to drive the cutter holder to move in a direction parallel to the forming table surface.

[0064] The feeding assembly 2 also includes a feeding gear 24, which is located at the end of the feeding screw 23 away from the forming platform. The building assembly 3 also includes a building gear 34, which is located at the end of the building screw 33 away from the forming platform. The main gear 61 meshes with the feeding gear 24 and the building gear 34 respectively. When the main gear 61 rotates, the feeding screw 23 and the building screw 33 rotate synchronously and in the same direction. Since the screw sleeve is fixed to the frame, when the screw rotates, the guide rail 62 on the side near the forming platform is a straight line parallel to the axis of the roller screw 53. The blade is driven by the motor to move along the guide rail. The main cutter holder 43 is driven by the blade to move parallel to the forming platform, and the direction of movement is parallel to the axis of the roller screw 53. The roller motor 63 drives the roller screw 53 to rotate. The roller shaft 51 is restricted by the roller groove 54 and rotates relative to the roller screw 53, and then translates along the roller groove 54.

[0065] The power assembly 6 also includes two sets of micro motors mounted on the secondary tool post 42, which are used to drive the secondary tool post 42 to move relative to the main tool post 43 along the tool post slide 44, and to drive the blade 41 to rotate relative to the secondary tool post 42.

[0066] The implementation principle of Example 1 is as follows:

[0067] When the upright photopolymer 3D printing equipment of this embodiment performs a printing process, the following steps are performed at the beginning of printing or after the previous slice is printed:

[0068] The main gear 61 rotates, driving the feeding screw 23 and the construction screw 33 to rotate. Specifically, in this embodiment, viewed from a top-down perspective, the main gear 61 rotates clockwise, while the feeding screw 23 and the construction screw 33 rotate counterclockwise. Under the interaction with the screw sleeve, the construction screw 33 drags the construction platform 31 down by the thickness of a working slice, and the feeding screw 23 pushes the feeding platform 21 up to push out the raw material in the feeding pool 22. The specific amount of pushing out is adapted to the amount of sinking of the construction platform 31. In this embodiment, the cross-sectional areas of the construction pool 32 and the feeding pool 22 are equal, and the feed amounts of the two screws are approximately equal.

[0069] The guide vane 62 rotates, and the vane is driven by the motor, which drives the main blade holder 43 to move from one end of the feeding assembly 2 to the other end of the building assembly 3 in a direction parallel to the forming table. The blade 41 contacts the forming table, scrapes over the upper edge of the feeding pool 22, and scrapes the ejected raw material towards the building assembly 3. The blade 41 scrapes over the upper edge of the building pool 32, fills the sinking space of the building pool 32 with raw material, and scrapes it flat.

[0070] Finally, the scraper assembly 4 returns to its original position, the projector 1 starts and solidifies the raw material at the predetermined position, realizing the printing of a work slice.

[0071] Optionally, in the case where the cooling element solidifies the metal paste at low temperature, the metal paste is already in a solid state each time the projector 1 operates. Before and after printing, it forms a complete and regular solid whole with the remaining metal paste. After the entire component is printed, the cooling element is turned off, and the uncured portion melts into metal paste. The part lifted from the build tank 32 is the complete workpiece, eliminating the need for an additional step of removing the support. Further, optionally, before each descent of the build platform 31, the heating element on the side wall of the build tank 32 is activated, briefly liquefying the portion between the solid whole and the side wall of the build tank 32 to facilitate the descent of the build platform 31.

[0072] Optionally, for metal slurries or powders with a high gas content, the feeding of the feeding tank 22 should take into account the compaction ratio, and the first feeding should exceed the volume after the calculated compaction ratio. When the scraper reaches the edge of the build tank 32, the secondary blade holder 42 moves relative to the main blade holder 43, creating a gap between the blade 41 and the forming table. After the blade 41 scrapes across the entire build tank 32, the material pile above the build tank 32 is higher than the forming table. The roller press motor 63 operates, driving the roller press screw 53 to rotate, which in turn drives the roller shaft 51 to push the roller sleeve 52 over the build tank 32 and then resets. The blade 41 rotates 180° relative to the secondary blade holder 42, and then the secondary blade holder 42 approaches the forming table, the cutting edge of the blade 41 abuts against the forming table, the main blade holder 43 resets, and the blade 41 scrapes across the forming table, flattening the material compacted by the roller sleeve 52 and scraping the excess material back to the feed tank 22. The secondary blade holder 42 moves away from the forming table, and the blade 41 rotates 180° relative to the secondary blade holder 42 to complete its reset. The projector 1 completes the curing, and the printing process of one working slice ends.

[0073] It should be noted that the roller 51 and roller sleeve 52 can be positioned on one side of the building pool 32. In this case, the secondary blade holder 42 should move away from the forming table so that the gap between the cutting edge of the blade 41 and the forming table is greater than the outer diameter of the roller sleeve 52. Alternatively, they can be positioned on one side of the feeding pool 22 so that the roller sleeve 52 can also roll the feeding pool 22.

[0074] The rolling process ensures that the powder or slurry comes into close contact with the formed green body, thus ensuring the effect of subsequent curing. Excess material is scraped back to the feeding pool 22. Since the material consumption and construction are balanced each time, there will be an overflow each time the material is fed, which is then scraped back to ensure sufficient material distribution.

[0075] The preferred printing material is a metal paste. In another embodiment of this invention, the material is a photocurable ceramic or a resin slurry.

[0076] Example 2

[0077] The difference between this embodiment and Embodiment 1 is that:

[0078] The side of the blade 41 used for scraping the liquid forms an acute angle with the forming table surface, and the acute angle is less than 60°.

[0079] Reference Figure 6 Preferably, the side of the blade 41 closest to the forming table is bent to a horizontal position, so that the side of the blade 41 used for scraping the liquid is in contact with the forming table.

[0080] The specific material spreading process is the same as the treatment method for metal slurry or powder with high gas content in Example 1.

[0081] The implementation principle of Example 2 is as follows:

[0082] When the blade 41 scrapes across the build tank 32, the raw material is not only pushed by the blade 41 and moved in a direction parallel to the forming table, but also subjected to a force towards the forming table by the blade 41, which plays a pre-compression role, so that the subsequent rolling effect is better, or the subsequent rolling process can be omitted to improve production efficiency.

[0083] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An upright photopolymerization 3D printing device, characterized in that, Includes a projector (1), a feeding assembly (2), a building assembly (3), a scraper assembly (4), a power assembly (6), and a platform; The feeding assembly (2) includes a feeding platform (21), a feeding pool (22), and a feeding screw (23). The sidewall of the feeding pool (22) is perpendicular to its bottom surface. The feeding platform (21) is disposed inside the feeding pool (22) and its edge is sealed to the sidewall of the feeding pool (22). The feeding platform (21) and the feeding screw (23) are rotatably connected. The feeding screw (23) rotates to move the feeding platform (21) away from or close to the bottom surface of the feeding pool (22). The construction component (3) includes a construction platform (31), a construction pool (32), and a construction screw (33). The sidewall of the construction pool (32) is perpendicular to its bottom surface. The construction platform (31) is disposed inside the construction pool (32) and its edge is sealed to the sidewall of the construction pool (32). The construction platform (31) and the construction screw (33) are rotatably connected. The construction screw (33) rotates to move the construction platform (31) away from or closer to the bottom surface of the construction pool (32). The frame includes a horizontal forming table and two equipment holes opened on the forming table. The building pool (32) and the feeding pool (22) are respectively fixedly connected in the equipment holes. The upper edge of the feeding pool (22) and the upper edge of the building pool (32) are flush with the forming table. The projector (1) is located on the side of the construction component (3) away from the construction screw (33), and the light emission direction is towards the construction pool (32); The scraper assembly (4) includes a blade holder and a blade (41) connected to the blade holder, the cutting edge of the blade (41) abutting against the forming table surface; The power assembly (6) is used to drive the feed screw (23) and the construction screw (33) to rotate, and to drive the tool holder to move in a direction parallel to the forming table surface; The scraper assembly (4) also includes a heater for heating the blade (41); The construction component (3) also includes a cooling plate for cooling or solidifying the metal slurry in the construction pool (32); The upright photopolymerization 3D printing equipment also includes a roller pressing assembly (5), which includes a roller shaft (51), a roller sleeve (52), and a roller pressing screw (53). The roller pressing screw (53) and the roller shaft (51) are perpendicular to each other, and the plane formed by the axis of the roller pressing screw (53) and the axis of the roller shaft (51) is a horizontal plane. The axial direction of the roller pressing screw (53) is parallel to the line connecting the geometric centers of the two equipment holes. The roller sleeve (52) is sleeved on the roller shaft (51) and abuts against the forming table. The roller pressing screw (53) is used to drive the roller shaft (51) to translate along the roller pressing screw (53), so that the roller sleeve (52) rolls the material in the feeding pool (22) and the building pool (32). The roller sleeve (52) is embedded with a resistance wire for heating the roller sleeve (52).

2. The upright photopolymerization 3D printing equipment according to claim 1, characterized in that, The power assembly (6) includes a main gear (61), the feeding assembly (2) also includes a feeding gear (24), the feeding gear (24) is located at the end of the feeding screw (23) away from the forming table, the building assembly (3) also includes a building gear (34), the building gear (34) is located at the end of the building screw (33) away from the forming table, the main gear (61) meshes with the feeding gear (24) and the building gear (34) respectively, and the feeding screw (23) and the building screw (33) rotate synchronously when the main gear (61) rotates.

3. The upright photopolymerization 3D printing equipment according to claim 1, characterized in that, The tool holder includes a main tool holder (43) and a secondary tool holder (42). One side of the main tool holder (43) is connected to the power assembly (6), and the other side has a tool holder groove (44) perpendicular to the forming table. The secondary tool holder (42) is slidably connected in the tool holder groove (44) and connected to the blade (41).

4. The upright photopolymerization 3D printing equipment according to claim 3, characterized in that, The secondary blade holder (42) and the blade (41) are rotatably connected, and the rotation axis is perpendicular to the forming table surface.

5. The upright photopolymerization 3D printing equipment according to claim 1, characterized in that, The side of the blade (41) used for scraping the liquid forms an acute angle with the forming table surface, and the acute angle is less than 60°.

6. The upright photopolymerization 3D printing equipment according to claim 1, characterized in that, The blade (41) is bent to a horizontal position on the side near the forming table, so that the side of the blade (41) used for scraping liquid partially fits against the forming table.

7. The upright photopolymerization 3D printing equipment according to any one of claims 1-6, characterized in that, The wavelength of the light emitted by the projector (1) is 355nm or 405nm.

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